drivers : remove drivers/mtd/hisilicon/sfc

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4IYX7?from=project-issue


CVE: NA

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This driver is not in use. Remove it.

Signed-off-by: fengsheng <fengsheng5@huawei.com>
Reviewed-by: lidongming <lidongming5@huawei.com>
Reviewed-by: ouyang delong <ouyangdelong@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>